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PDF TMP421 Data sheet ( Hoja de datos )
| Número de pieza | TMP421 | |
| Descripción | (TMP421 / TMP422) Remote and Local TEMPERATURE SENSOR | |
| Fabricantes | Burr-Brown Corporation | |
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BurrĆBrown Products
from Texas Instruments
TMP421
TMP422
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
±1°C Remote and Local TEMPERATURE SENSOR
in SOT23-8
FEATURES
1
•2345 SOT23-8 PACKAGE
• ±1°C REMOTE DIODE SENSOR (MAX)
• ±1.5°C LOCAL TEMPERATURE SENSOR (MAX)
• SERIES RESISTANCE CANCELLATION
• n-FACTOR CORRECTION
• TWO-WIRE/SMBus™ SERIAL INTERFACE
• MULTIPLE INTERFACE ADDRESSES
• DIODE FAULT DETECTION
• RoHS COMPLIANT AND NO Sb/Br
APPLICATIONS
• PROCESSOR/FPGA TEMPERATURE
MONITORING
• LCD/DLP®/LCOS PROJECTORS
• SERVERS
• CENTRAL OFFICE TELECOM EQUIPMENT
• STORAGE AREA NETWORKS (SAN)
DESCRIPTION
The TMP421 and TMP422 are remote temperature
sensor monitors with a built-in local temperature
sensor. The remote temperature sensor
diode-connected transistors are typically low-cost,
NPN- or PNP-type transistors or diodes that are an
integral part of microcontrollers, microprocessors, or
FPGAs.
Remote accuracy is ±1°C for multiple IC
manufacturers, with no calibration needed. The
Two-Wire serial interface accepts SMBus write byte,
read byte, send byte, and receive byte commands to
configure the device.
the TMP421 and TMP422 include series resistance
cancellation, programmable non-ideality factor, wide
remote temperature measurement range (up to
+150°C), and diode fault detection.
The TMP421 and TMP422 are both available in an
8-lead, SOT23 package.
V+
8
V+
5 GND
N-Factor
Correction
Local
Temperature
Register
Conversion
Rate
Register
1 DXP
2 DXN
Remote
Temperature
Register
Status
Register
TMP421
Configuration
Register
Manufacturer
ID Register
Device
ID Register
Configuration
Register
Resolution
Register
3 A1
4 A0
Bus
Interface
SCL
7
SDA
6
Pointer
Register
V+
8
V+
5 GND
N-Factor
Correction
Local
Temperature
Register
1 DX1
Conversion
Rate
Register
2 DX2
3
DX3
4
DX4
Remote
Temperature
Register
Status
Register
TMP422
Configuration
Register
Manufacturer
ID Register
Device
ID Register
Configuration
Register
Resolution
Register
Bus
Interface
SCL
7
SDA
6
Pointer
Register
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DLP is a registered trademark of Texas Instruments.
2
SMBus is a trademark of Intel Corporation.
3
I2C is a trademark of NXP Semiconductors.
4
All other trademarks are the property of their respective owners.
5
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated
1 page  
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TMP421
TMP422
www.ti.com
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
TYPICAL CHARACTERISTICS
At TA = +25°C and VS = +5.0V, unless otherwise noted.
REMOTE TEMPERATURE ERROR
vs TEMPERATURE
3
VS = 3.3V
TREMOTE = +25°C
2 30 Typical Units Shown
h = 1.008
1
LOCAL TEMPERATURE ERROR
vs TEMPERATURE
3.0
VS = 3.3V
50 Units Shown
2.0
1.0
00
-1 -1.0
-2 -2.0
-3
-50
60
-25 0 25 50 75 100
Ambient Temperature, TA (°C)
Figure 1.
REMOTE TEMPERATURE ERROR
vs LEAKAGE RESISTANCE
125
40
20
R -GND
0
R -VS
-20
-40
-60
0
5 10 15 20 25
Leakage Resistance (MW)
Figure 3.
30
REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE
(GND Collector-Connected Transistor, 2N3906 PNP)
2.0
1.5
VS = 2.7V
1.0
0.5
0 VS = 5.5V
-0.5
-1.0
-1.5
-2.0
0
500 1000 1500 2000 2500 3000 3500
RS (W)
Figure 5.
-3.0
-50 -25
0
25 50 75 100 125
Ambient Temperature, TA (°C)
Figure 2.
REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE
(Diode-Connected Transistor, 2N3906 PNP)
2.0
1.5
VS = 2.7V
1.0
0.5
0
-0.5
VS = 5.5V
-1.0
-1.5
-2.0
0
500 1000 1500 2000 2500 3000 3500
RS (W)
Figure 4.
REMOTE TEMPERATURE ERROR
vs DIFFERENTIAL CAPACITANCE
3
2
1
0
-1
-2
-3
0
0.5 1.0 1.5 2.0 2.5 3.0
Capacitance (nF)
Figure 6.
Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TMP421 TMP422
Submit Documentation Feedback
5
5 Page 
TMP421
TMP422
www.ti.com
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
The remaining bits of the Configuration Register are
reserved and must always be set to '0'. The power-on
reset value for this register is 00h. Table 5
summarizes the bits of the Configuration Register.
CONFIGURATION REGISTER 2
Configuration Register 2 (pointer address 0Ah)
controls which temperature measurement channels
are enabled and whether the external channels have
the resistance correction feature enabled or not.
The RC bit enables the resistance correction feature
for the external temperature channels. If RC = '1',
series resistance correction is enabled; if RC = '0',
resistance correction is disabled. Resistance
correction should be enabled for most applications.
However, disabling the resistance correction may
yield slightly improved temperature measurement
noise performance, and reduce conversion time by
about 50%, which could lower power consumption
when conversion rates of two per second or less are
selected.
The LEN bit enables the local temperature
measurement channel. If LEN = '1', the local channel
is enabled; if LEN = '0', the local channel is disabled.
The REN bit enables external temperature
measurement channel 1 (connected to pins 1 and 2.)
If REN = '1', the external channel is enabled; if REN =
'0', the external channel is disabled.
For the TMP422 only, the REN2 bit enables the
second external measurement channel (connected to
pins 3 and 4.) If REN2 = '1', the second external
channel is enabled; if REN = '0', the second external
channel is disabled.
The temperature measurement sequence is local
channel, external channel 1, external channel 2,
shutdown, and delay (to set conversion rate, if
necessary). The sequence starts over with local
channel. If any of the channels are disabled, they are
skipped in the sequence.
BIT
7
6
5, 4, 3
2
1, 0
Table 5. Configuration Register 1 Bit Descriptions
CONFIGURATION REGISTER 1 (Read/Write = 09h, POR = 00h)
NAME
FUNCTION
Reserved
—
SD
0 = Run
1 = Shut Down
Reserved
—
Temperature Range
0 = –55°C to +127°C
1 = –55°C to +150°C
Reserved
—
POWER-ON RESET VALUE
0
0
0
0
0
Table 6. Configuration Register 2 Bit Descriptions
CONFIGURATION REGISTER 2 (Read/Write = 0Ah, POR = 1Ch for TMP421; 3Ch for TMP422)
BIT
NAME
FUNCTION
POWER-ON RESET VALUE
7, 6 Reserved
—
0
5
REN2
0 = External Channel 2 Disabled
1 = External Channel 2 Enabled
1 (TMP422)
0 (TMP421)
4
REN
0 = External Channel 1 Disabled
1 = External Channel 1 Enabled
1
3
LEN
0 = Local Channel Disabled
1 = Local Channel Enabled
1
2
RC
0 = Resistance Correction Disabled
1 = Resistance Correction Enabled
1
1, 0 Reserved
—
0
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TMP421 TMP422
Submit Documentation Feedback
11
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| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet TMP421.PDF ] | |
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